diff --git a/src/app/auth/actions.ts b/src/app/auth/actions.ts
new file mode 100644
index 0000000..3153b7b
--- /dev/null
+++ b/src/app/auth/actions.ts
@@ -0,0 +1,10 @@
+'use server';
+
+import { createClient } from '@/lib/supabase/server';
+import { redirect } from 'next/navigation';
+
+export async function logoutAction() {
+  const supabase = await createClient();
+  await supabase.auth.signOut();
+  redirect('/login');
+}
diff --git a/src/app/dashboard/layout.tsx b/src/app/dashboard/layout.tsx
index 6abe019..8cb7d13 100644
--- a/src/app/dashboard/layout.tsx
+++ b/src/app/dashboard/layout.tsx
@@ -6,18 +6,30 @@ import {
   FolderGit2, 
   Bot, 
   ShieldCheck,
-  Layers
+  Layers,
+  LogOut,
+  UserCheck
 } from 'lucide-react';
+import { createClient } from '@/lib/supabase/server';
+import { logoutAction } from '@/app/auth/actions';
 
-export default function DashboardLayout({
+export default async function DashboardLayout({
   children,
 }: {
   children: React.ReactNode;
 }) {
+  const supabase = await createClient();
+  const { data: { user } } = await supabase.auth.getUser();
+
+  const role = user?.user_metadata?.role || user?.app_metadata?.role || 'client';
+  const company = user?.user_metadata?.company || '4Ventures Central';
+  const email = user?.email || 'usuario@4ventures.es';
+  const isAgency = role === 'admin' || role === 'team';
+
   return (
     <div className="flex min-h-screen bg-[#0B0F19]">
       {/* Sidebar */}
-      <aside className="w-64 border-r border-gray-800 bg-[#0D121F] flex flex-col justify-between p-4">
+      <aside className="w-64 border-r border-gray-800 bg-[#0D121F] flex flex-col justify-between p-4 shrink-0">
         <div>
           <div className="flex items-center gap-3 px-2 py-4 border-b border-gray-800/80 mb-6">
             <div className="w-9 h-9 rounded-lg bg-gradient-to-br from-brand-500 to-amber-600 flex items-center justify-center font-bold text-white shadow-lg shadow-brand-500/20">
@@ -58,27 +70,53 @@ export default function DashboardLayout({
               <Bot className="w-4 h-4 text-purple-400" />
               Asistente IA Financiero
             </Link>
-            <div className="pt-4 mt-4 border-t border-gray-800/60">
-              <span className="px-3 text-[10px] font-bold uppercase tracking-wider text-gray-400">Agencia OS</span>
-              <Link
-                href="/dashboard/agencia"
-                className="flex items-center gap-3 px-3 py-2.5 mt-1 rounded-lg text-sm font-medium text-gray-300 hover:text-white hover:bg-gray-800/60 transition-all"
-              >
-                <Layers className="w-4 h-4 text-amber-400" />
-                Cartera Cross-Tenant
-              </Link>
-            </div>
+
+            {isAgency && (
+              <div className="pt-4 mt-4 border-t border-gray-800/60">
+                <span className="px-3 text-[10px] font-bold uppercase tracking-wider text-gray-400">Agencia OS</span>
+                <Link
+                  href="/dashboard/agencia"
+                  className="flex items-center gap-3 px-3 py-2.5 mt-1 rounded-lg text-sm font-medium text-gray-300 hover:text-white hover:bg-gray-800/60 transition-all"
+                >
+                  <Layers className="w-4 h-4 text-amber-400" />
+                  Cartera Cross-Tenant
+                </Link>
+              </div>
+            )}
           </nav>
         </div>
 
-        <div className="pt-4 border-t border-gray-800/80 text-xs text-gray-400 space-y-2">
-          <div className="flex items-center justify-between px-2">
-            <span className="flex items-center gap-1.5 text-emerald-400">
-              <ShieldCheck className="w-3.5 h-3.5" /> Aislamiento RLS
-            </span>
-            <span className="bg-gray-800 px-1.5 py-0.5 rounded text-[10px] text-gray-300">VPS Hostinger</span>
+        {/* Sidebar Footer with User Info & Logout */}
+        <div className="pt-4 border-t border-gray-800/80 space-y-3">
+          <div className="px-2 py-2 rounded-xl bg-gray-900/60 border border-gray-800/80">
+            <div className="flex items-center gap-2 mb-1">
+              <UserCheck className="w-3.5 h-3.5 text-brand-400 shrink-0" />
+              <p className="text-xs font-medium text-white truncate">{email}</p>
+            </div>
+            <div className="flex items-center justify-between">
+              <span className="text-[10px] text-gray-400 capitalize">{company}</span>
+              <span className="text-[9px] uppercase tracking-wider font-semibold px-1.5 py-0.5 rounded bg-brand-500/20 text-brand-400">
+                {role}
+              </span>
+            </div>
+          </div>
+
+          <form action={logoutAction}>
+            <button
+              type="submit"
+              className="w-full flex items-center justify-center gap-2 px-3 py-2 rounded-lg text-xs font-medium text-gray-400 hover:text-red-400 hover:bg-red-500/10 border border-transparent hover:border-red-500/20 transition-all cursor-pointer"
+            >
+              <LogOut className="w-3.5 h-3.5" />
+              Cerrar Sesión
+            </button>
+          </form>
+
+          <div className="flex items-center justify-between px-2 pt-1 text-[11px] text-gray-500">
+            <span className="flex items-center gap-1 text-emerald-400">
+              <ShieldCheck className="w-3 h-3" /> RLS Activo
+            </span>
+            <span>VPS Hostinger</span>
           </div>
-          <p className="px-2 text-[11px] text-gray-500">Hostinger VPS · Dokploy</p>
         </div>
       </aside>
 
@@ -86,9 +124,9 @@ export default function DashboardLayout({
       <div className="flex-1 flex flex-col min-w-0">
         <header className="h-16 border-b border-gray-800 bg-[#0D121F]/50 backdrop-blur px-8 flex items-center justify-between">
           <div className="flex items-center gap-2 text-sm text-gray-400">
-            <span>Tenant:</span>
-            <span className="bg-brand-500/10 text-brand-500 font-semibold px-2 py-0.5 rounded border border-brand-500/20">
-              4Ventures Central
+            <span>Cliente / Portal:</span>
+            <span className="bg-brand-500/10 text-brand-400 font-semibold px-2.5 py-1 rounded-md border border-brand-500/20">
+              {company}
             </span>
           </div>
           <div className="flex items-center gap-4">
diff --git a/src/app/login/page.tsx b/src/app/login/page.tsx
new file mode 100644
index 0000000..8e1dd47
--- /dev/null
+++ b/src/app/login/page.tsx
@@ -0,0 +1,168 @@
+'use client';
+
+import React, { useState, Suspense } from 'react';
+import { useRouter, useSearchParams } from 'next/navigation';
+import { createClient } from '@/lib/supabase/client';
+import { Mail, Lock, Eye, EyeOff, ShieldCheck, ArrowRight, Loader2 } from 'lucide-react';
+
+function LoginForm() {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  const next = searchParams.get('next') || '/dashboard/kpis';
+
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+  const [showPassword, setShowPassword] = useState(false);
+  const [loading, setLoading] = useState(false);
+  const [errorMsg, setErrorMsg] = useState<string | null>(null);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setErrorMsg(null);
+    setLoading(true);
+
+    try {
+      const supabase = createClient();
+      const { data, error } = await supabase.auth.signInWithPassword({
+        email: email.trim(),
+        password: password,
+      });
+
+      if (error) {
+        setErrorMsg('Credenciales inválidas. Verifica tu correo y contraseña.');
+        setLoading(false);
+        return;
+      }
+
+      if (data.session) {
+        router.push(next);
+        router.refresh();
+      }
+    } catch (err: any) {
+      setErrorMsg(err?.message || 'Error de conexión con el servidor de autenticación.');
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="bg-[#0D121F] border border-gray-800/80 rounded-2xl p-8 shadow-2xl shadow-black/50 backdrop-blur-sm">
+      <div className="mb-6">
+        <h2 className="text-lg font-semibold text-white">Iniciar Sesión</h2>
+        <p className="text-xs text-gray-400 mt-1">Introduce tus credenciales corporativas para acceder a tu portal.</p>
+      </div>
+
+      {errorMsg && (
+        <div className="mb-6 p-3.5 rounded-xl bg-red-500/10 border border-red-500/30 text-red-400 text-xs flex items-center gap-2">
+          <span className="w-2 h-2 rounded-full bg-red-500 shrink-0" />
+          <span>{errorMsg}</span>
+        </div>
+      )}
+
+      <form onSubmit={handleSubmit} className="space-y-4">
+        <div>
+          <label className="block text-xs font-medium text-gray-300 mb-1.5">
+            Correo Electrónico
+          </label>
+          <div className="relative">
+            <div className="absolute inset-y-0 left-0 pl-3.5 flex items-center pointer-events-none text-gray-400">
+              <Mail className="w-4 h-4" />
+            </div>
+            <input
+              type="email"
+              required
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              placeholder="ejemplo@cliente.com"
+              className="w-full pl-10 pr-4 py-2.5 bg-gray-900/80 border border-gray-800 rounded-xl text-sm text-white placeholder-gray-500 focus:outline-none focus:border-brand-500 focus:ring-1 focus:ring-brand-500 transition-all"
+            />
+          </div>
+        </div>
+
+        <div>
+          <label className="block text-xs font-medium text-gray-300 mb-1.5">
+            Contraseña
+          </label>
+          <div className="relative">
+            <div className="absolute inset-y-0 left-0 pl-3.5 flex items-center pointer-events-none text-gray-400">
+              <Lock className="w-4 h-4" />
+            </div>
+            <input
+              type={showPassword ? 'text' : 'password'}
+              required
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              placeholder="••••••••••••"
+              className="w-full pl-10 pr-10 py-2.5 bg-gray-900/80 border border-gray-800 rounded-xl text-sm text-white placeholder-gray-500 focus:outline-none focus:border-brand-500 focus:ring-1 focus:ring-brand-500 transition-all"
+            />
+            <button
+              type="button"
+              onClick={() => setShowPassword(!showPassword)}
+              className="absolute inset-y-0 right-0 pr-3.5 flex items-center text-gray-400 hover:text-gray-200 transition-colors"
+            >
+              {showPassword ? <EyeOff className="w-4 h-4" /> : <Eye className="w-4 h-4" />}
+            </button>
+          </div>
+        </div>
+
+        <button
+          type="submit"
+          disabled={loading}
+          className="w-full mt-2 py-3 px-4 rounded-xl bg-gradient-to-r from-brand-500 to-amber-600 hover:from-brand-600 hover:to-amber-700 text-white font-medium text-sm shadow-lg shadow-brand-500/20 flex items-center justify-center gap-2 transition-all disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer"
+        >
+          {loading ? (
+            <>
+              <Loader2 className="w-4 h-4 animate-spin" />
+              <span>Verificando credenciales...</span>
+            </>
+          ) : (
+            <>
+              <span>Acceder al Centro de Mando</span>
+              <ArrowRight className="w-4 h-4" />
+            </>
+          )}
+        </button>
+      </form>
+    </div>
+  );
+}
+
+export default function LoginPage() {
+  return (
+    <div className="min-h-screen bg-[#0B0F19] text-gray-100 flex flex-col justify-center items-center px-4 relative overflow-hidden">
+      {/* Background Glow */}
+      <div className="absolute top-1/4 left-1/2 -translate-x-1/2 -translate-y-1/2 w-[600px] h-[350px] bg-gradient-to-tr from-brand-500/10 via-amber-500/5 to-purple-600/10 blur-[120px] rounded-full pointer-events-none" />
+
+      <div className="w-full max-w-md relative z-10">
+        {/* Header Branding */}
+        <div className="text-center mb-8">
+          <div className="inline-flex items-center justify-center w-14 h-14 rounded-2xl bg-gradient-to-br from-brand-500 to-amber-600 text-white font-bold text-xl shadow-xl shadow-brand-500/20 mb-4 border border-brand-400/30">
+            4V
+          </div>
+          <h1 className="text-2xl font-bold tracking-tight text-white">4VENTURES</h1>
+          <p className="text-sm text-gray-400 mt-1 font-medium">Centro de Mando del Cliente</p>
+        </div>
+
+        {/* Login Box wrapped in Suspense for useSearchParams */}
+        <Suspense fallback={
+          <div className="bg-[#0D121F] border border-gray-800/80 rounded-2xl p-8 flex justify-center items-center h-64">
+            <Loader2 className="w-6 h-6 animate-spin text-brand-500" />
+          </div>
+        }>
+          <LoginForm />
+        </Suspense>
+
+        {/* Security Footer */}
+        <div className="mt-8 flex items-center justify-center gap-4 text-[11px] text-gray-400">
+          <div className="flex items-center gap-1.5">
+            <ShieldCheck className="w-3.5 h-3.5 text-emerald-400" />
+            <span>Aislamiento RLS Multi-Tenant</span>
+          </div>
+          <span>•</span>
+          <span>Cifrado TLS v1.3</span>
+          <span>•</span>
+          <span>Dokploy VPS</span>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/app/page.tsx b/src/app/page.tsx
index 1f1ce9d..10923c2 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -1,5 +1,13 @@
 import { redirect } from 'next/navigation';
+import { createClient } from '@/lib/supabase/server';
 
-export default function Home() {
-  redirect('/dashboard/kpis');
+export default async function Home() {
+  const supabase = await createClient();
+  const { data: { user } } = await supabase.auth.getUser();
+
+  if (user) {
+    redirect('/dashboard/kpis');
+  } else {
+    redirect('/login');
+  }
 }
diff --git a/src/middleware.ts b/src/middleware.ts
index 750bb02..c37ca92 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -1,11 +1,71 @@
+import { createServerClient } from '@supabase/ssr';
 import { NextRequest, NextResponse } from 'next/server';
 
-export function middleware(req: NextRequest) {
-  const url = req.nextUrl.clone();
-  const hostname = req.headers.get('host') || '';
+export async function middleware(req: NextRequest) {
+  let res = NextResponse.next({
+    request: {
+      headers: req.headers,
+    },
+  });
 
-  // 1. Extraer slug desde subdominio (ej: acme.4ventures.es)
-  let tenantSlug = '4ventures-hub';
+  const supabase = createServerClient(
+    process.env.NEXT_PUBLIC_SUPABASE_URL!,
+    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
+    {
+      cookies: {
+        getAll() {
+          return req.cookies.getAll();
+        },
+        setAll(cookiesToSet) {
+          cookiesToSet.forEach(({ name, value }) => req.cookies.set(name, value));
+          res = NextResponse.next({
+            request: {
+              headers: req.headers,
+            },
+          });
+          cookiesToSet.forEach(({ name, value, options }) =>
+            res.cookies.set(name, value, options)
+          );
+        },
+      },
+    }
+  );
+
+  const {
+    data: { user },
+  } = await supabase.auth.getUser();
+
+  const url = req.nextUrl.clone();
+  const path = url.pathname;
+
+  // 1. Redirigir usuarios no autenticados que intenten acceder al dashboard
+  if (!user && (path === '/' || path.startsWith('/dashboard'))) {
+    const loginUrl = req.nextUrl.clone();
+    loginUrl.pathname = '/login';
+    if (path.startsWith('/dashboard')) {
+      loginUrl.searchParams.set('next', path);
+    }
+    return NextResponse.redirect(loginUrl);
+  }
+
+  // 2. Redirigir usuarios autenticados que intenten acceder a /login
+  if (user && path === '/login') {
+    const dashboardUrl = req.nextUrl.clone();
+    dashboardUrl.pathname = '/dashboard/kpis';
+    return NextResponse.redirect(dashboardUrl);
+  }
+
+  // 3. Proteger la vista directiva de agencia contra clientes
+  const role = user?.app_metadata?.role || user?.user_metadata?.role || 'client';
+  if (user && role === 'client' && path.startsWith('/dashboard/agencia')) {
+    const forbiddenUrl = req.nextUrl.clone();
+    forbiddenUrl.pathname = '/dashboard/kpis';
+    return NextResponse.redirect(forbiddenUrl);
+  }
+
+  // 4. Resolver Tenant Slug (desde subdominio, metadata de usuario o cookie)
+  let tenantSlug = user?.user_metadata?.slug || user?.app_metadata?.slug || '4ventures-hub';
+  const hostname = req.headers.get('host') || '';
   const parts = hostname.split('.');
 
   if (parts.length > 2) {
@@ -15,29 +75,26 @@ export function middleware(req: NextRequest) {
     }
   }
 
-  // 2. Override opcional vía query param ?tenant=slug
   const queryTenant = url.searchParams.get('tenant');
   if (queryTenant) {
     tenantSlug = queryTenant.toLowerCase();
   } else {
     const cookieTenant = req.cookies.get('4v_tenant')?.value;
-    if (cookieTenant) {
+    if (cookieTenant && !user?.user_metadata?.slug) {
       tenantSlug = cookieTenant;
     }
   }
 
-  const response = NextResponse.next({
-    request: {
-      headers: new Headers(req.headers)
-    }
-  });
+  res.headers.set('x-tenant-slug', tenantSlug);
+  res.headers.set('x-user-role', role);
+  if (user?.email) {
+    res.headers.set('x-user-email', user.email);
+  }
+  res.cookies.set('4v_tenant', tenantSlug, { path: '/', maxAge: 60 * 60 * 24 * 30 });
 
-  response.headers.set('x-tenant-slug', tenantSlug);
-  response.cookies.set('4v_tenant', tenantSlug, { path: '/', maxAge: 60 * 60 * 24 * 30 });
-
-  return response;
+  return res;
 }
 
 export const config = {
-  matcher: ['/((?!_next/static|_next/image|favicon.ico|_4v_attr.js).*)']
+  matcher: ['/((?!_next/static|_next/image|favicon.ico|_4v_attr.js|api/chat|api/simulate).*)']
 };